base64_urlencode {base64url}

Encode to base64 or Decode from base64

Description

In contrast to RFC3548, the 62nd character (‘+’) is replaced with ‘-’, the 63rd character (‘/’) is replaced with ‘_’. Furthermore, the encoder does not fill the string with trailing ‘=’. The resulting encoded strings comply to the regular expression pattern “[A-Za-z0-9_-]” and thus are safe to use in URLs or for file names.

Usage

base64_urlencode(x)

base64_urldecode(x)

Arguments

x

[character(1)]
Character vector to encode or decode.

Value

[character] of the same length as input x.

References

Implementation based on base64 encoder/decoder in the Apache Portable Runtime (APR): https://svn.apache.org/repos/asf/apr/apr/trunk/encoding/apr_base64.c

Examples

x = "plain text"
encoded = base64_urlencode(x)
decoded = base64_urldecode(encoded)
print(encoded)
print(decoded)